MCQ
The $IUPAC$ name of $\begin{array}{*{20}{c}}
  {C{H_2} - C = CH - C{H_2}OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,Cl\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_{3\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$ is
  • $4-$ Chloro $-3-$ methylbut $-2-$ en $-1-$ ol
  • B
    $1-$ Chloro $-2-$ methylbut $-2-$ en $-4-$ ol
  • C
    $4-$ Chloro $-1-$ hydroxy $-3-$ methylbut, $2-$ ene
  • D
    $1-$ Chloro $-4-$ hydroxy $-2-$ methylbut $-2-$ ene

Answer

Correct option: A.
$4-$ Chloro $-3-$ methylbut $-2-$ en $-1-$ ol
a
Priority of - $OH$ group is greater than halide group. Numbering will be started from right end.

$\therefore$ IUPAC name: $4$ - chloro-$3$- methylbut -$2$- en -$1$- ol.

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